Protestant Christians have faith “Sola Scriptura”, seeing Christian Ethics as Theonomous and based only on God’s commands… usually as found in Scripture, which is understood to be the Words of God and Inerrant. Despite this, relatively few Protestants would accept that the Bible is a comprehensive moral guide because there are some subjects on which the Bible says nothing (such as Abortion, IVF, Assisted Dying) and because even where the Bible does speak, what is said is in need of interpretation. As a result, the Bible is not a comprehensive moral guide.
Firstly, even Karl Barth rejected the claim that the Bible is a comprehensive moral guide. Barth criticised both Natural Theology and Natural Law, the Roman Catholic claim that we can discover most of what is right and wrong using reason, because he believed that this has been corrupted by the Fall. Drawing on the writings of St Paul and St Augustine, Barth argued that we are saved by grace and faith and not because of anything we have done (Ephesians 2:8), suggesting that we can’t discover God’s existence or nature using reason and neither can we discover right and wrong, let alone use this knowledge to earn our own salvation by works (the Pelagian heresy). For Barth, knowledge of God and what is good must be revealed and this revelation is for most people through Scripture. Yet Barth also criticised the view that the Bible is a comprehensive moral guide. This is because Scripture is not itself God’s revelation, but rather witness to God’s revelation through Jesus and the Prophets. Being only a record of what was revealed, rather than revelation, it should be seen as a human creation and subject to some errors and omissions, however minor. For Barth, as for Bonhoeffer, Christians should reflect on their reading of Scripture as a whole and on the example of Jesus when making moral decisions autonomously and personally, rather than trying to follow lines of the Bible individually on face value. Today, scholars such as NT Wright and Peter Enns agree with Barth’s approach to Biblical Ethics. For NT Wright, the narrative or story of the Bible is true and inerrant, but the idea that isolated parts can be taken literally out of context and without proper interpretation is mistaken. Similarly, Enns points out that the Bible is a human creation which reflects its cultural contexts and authors’ perspectives. Surely, God speaks through scripture, but it should not be understood as a transcript of God’s words, let alone as a comprehensive guide to God’s thinking on moral issues. Biblical Criticism supports the approach to Scripture taken by Barth, Wright and Enns. Textual analysis has shown that the Bible was written by multiple authors and repeatedly redacted, as well as that the historical, political and theological concerns of the authors and redactors are reflected in the text. Given this, as well as the existence of multiple translations and editions of the Bible, it is hard to see that it is intellectually credible to argue that the Bible is a comprehensive moral guide.
In addition, the Roman Catholic Church, while upholding the principle of Biblical Inerrancy, dismisses the idea that the Bible is a comprehensive moral guide. For Roman Catholics, Scripture is one source of moral authority among others, including Tradition and Reason (Natural Law). As Aquinas pointed out, Scripture needs to be read as a whole and through “the lens of doctrine” or it can seem to give guidance that contradicts reason and/or Christian tradition. For example, in Romans 2:6 the Bible says “God will repay each one according to his deeds.” and of course Matthew 25 says much the same thing through the Parable of the Sheep and Goats, while the Bible also says that people are saved by Grace and Faith and not because of anything they have done in Ephesians 2:8-9. This seems contradictory and could lead an individual Protestant who reads the Bible to believe that they are saved because of good works and perhaps that anybody who does good works will be saved, while this contradicts Christian tradition which is clearly Sola Gratia and exclusivist. Roman Catholics point out that following Church Teachings, which are informed by Tradition and Reason as well as Scripture, which itself is interpreted “through the lens of doctrine” and as a whole rather than in isolated parts, guards against being led into error in this way. Of course, evangelical Protestants will reject this argument that Christian Ethics should be Heteronomous, reasoning that the Bible itself says that the Holy Spirit will guide those who God has saved to the truth, so they do not misunderstand God’s will when reading Scripture. “But when he, the Spirit of truth, comes, he will guide you into all the truth.” John 16:13 Yet Roman Catholics would reject this and say that this is a very particular interpretation of this passage and does not explain how faithful Christians can read Scripture and end up with multiple interpretations of what it says. If having the “right interpretation” depends on having been saved and having “wrong interpretations” is symptomatic of having not received God’s Grace and Spirit, then when multiple interpretations exist amongst God’s fearing and good people – as is evidenced by the multiplicity of Protestant denominations for example – how is anybody to know what the “right interpretation” and God’s law is? The result of arguing that Scripture is a comprehensive moral guide is to leave Christian Ethics up to the consciences of individuals, giving them license to believe that anything that they feel led to believe is what God commands. This is not a practical approach to Christian Ethics. The Yorkshire Ripper Peter Sutcliffe believed that he was led by God to murder women, quoting his readings of scripture to justify his heinous crimes… can anybody really say that he should have listened to his conscience and that he was right to do so when it led him to break God’s sixth Commandment (Exodus 20:13) as well as the whole of Christian tradition and reason? While Acts 5:29 does say “we must obey God rather than human beings”, suggesting that doing what is right may well break social norms and even religious teachings, the argument that Christian Ethics consists in following one’s personal “conscience” wherever it leads, provided that these leadings were inspired by one’s reading of the Bible in some way (however idiosyncratic or irrational), is difficult to defend. This suggests that the Bible is not a comprehensive moral guide.
On the other hand, the Bible itself suggests that it is a comprehensive moral guide – at least in parts – so Protestants who have faith Sola Scriptura and uphold Biblical Inerrancy may feel bound to accept that the Bible is a comprehensive moral guide. St Paul wrote that “all scripture is God-breathed and is useful for teaching… so that the servant of God may be thoroughly equipped for every good work…” 2 Timothy 3:16-17; this implies that the Bible is a complete moral handbook for Christians. On the other hand, Roman Catholics have pointed out that this quotation is taken out of context, ignoring the preceding sentence “continue in what you have learned and have become convinced of, because you know those from whom you learned it” 2 Timothy 3:14, which suggests that there are sources of authority besides the Bible. Further, there are other passages in the Bible which suggest that there are moral authorities outside of Scripture. Romans 13:1 affirms “Let everyone be subject to the governing authorities, for there is no authority except that which God has established.” suggesting that Christians should obey those who have power and worldly authority as well as the “plain word of Scripture”. This is confirmed by Hebrews 13:17. Further, the Bible also says that ignorant people can misinterpret Scripture, suggesting that Luther was wrong to suggest that “A simple layman armed with Scripture is to be believed above a pope or a cardinal without it.” St Peter wrote of St Paul’s letters – amongst which 2 Timothy purports to be – that “His letters contain some things that are hard to understand, which ignorant and unstable people distort, as they do the other Scriptures, to their own destruction.” 2 Peter 3:16, suggesting that it is possible for people to be misled by the word of Scripture and that additional education may be necessary to understand its true meaning. In this way, the Roman Catholic Church’s teaching on the authority of Scripture – that it must be acknowledged as “teaching solidly, faithfully and without error that truth which God wanted put into sacred writings for the sake of salvation.” Dei Verbum but that the Church holds the authority to interpret it, to discover and communicate that truth to ordinary people, handed down from St Peter who received it from Jesus (Matthew 18:18) – is more persuasive than the minority Protestant view that Scripture is a comprehensive moral guide. Further, using the inerrancy of the Bible to justify having faith in the inerrancy and completeness of the Bible is a circular argument which as such is unconvincing. Nevertheless, Evangelical Protestants such as RC Sproul, JI Packer and more recently Wayne Grudem have argued that the Bible is a comprehensive moral guide. They stress Biblical Inerrancy, arguing that faith in God means faith in God’s word in scripture. If one doubts the Bible and its teaching in any part, it is the same as doubting God’s authority and not consistent with being a Christian. St Augustine made this point, as did Harold Lindsell in “The Battle for the Bible”, published in 1978, the same year that many Protestant leaders signed up to the Chicago Statement on Biblical Inerrancy. Yet, despite signing the Chicago Statement on inerrancy, even Evangelical scholars like Wayne Grudem stop short of claiming that the Bible is a comprehensive moral guide today, because the Bible does not address many contemporary moral issues. He wrote “the Bible always tells the truth, and it always tells the truth concerning everything that it talks about.” This suggests that there may be things that the Bible does not talk about, about which it does not tell the truth, and so that the Bible is not a comprehensive moral guide.
In conclusion, the Bible is not a comprehensive moral guide. This is accepted by Protestant authorities such as Karl Barth as well as by the Roman Catholic Church and is supported by reason, evidence and even some parts of the Bible itself. Even those few evangelical protestant scholars who seem to support this claim stop short of actually endorsing the idea that the Bible is a comprehensive or complete guide when it comes to modern moral issues.